42305 has 4 divisors (see below), whose sum is σ = 50772. Its totient is φ = 33840.

The previous prime is 42299. The next prime is 42307. The reversal of 42305 is 50324.

42305 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25921 + 16384 = 161^2 + 128^2 .

It is not a de Polignac number, because 42305 - 2¹⁰ = 41281 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 42305.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 42305.

It is not an unprimeable number, because it can be changed into a prime (42307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4226 + ... + 4235.

It is an arithmetic number, because the mean of its divisors is an integer number (12693).

2⁴²³⁰⁵ is an apocalyptic number.

It is an amenable number.

42305 is a deficient number, since it is larger than the sum of its proper divisors (8467).

42305 is an equidigital number, since it uses as much as digits as its factorization.

42305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8466.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 42305 is about 205.6817930688. The cubic root of 42305 is about 34.8442055046.

Adding to 42305 its reverse (50324), we get a palindrome (92629).

The spelling of 42305 in words is "forty-two thousand, three hundred five".